/*重置样式*/
* {
  margin: 0;
  padding: 0;
}
ul li {
  list-style: none;
}
a {
  color: black;
  text-decoration: none;
}
/*导航*/
.navi {
  width: 500px;
  height: 56px;
  margin: 20px auto;
  position: relative;
  left: 0;
  top: 0;
}
.navi ul li {
  float: left;
}
.navi ul li:hover a {
  color: white;
}
.navi ul li a {
  display: inline-block;
  color: #3c3c3c;
  font-family: "微软雅黑";
  font-size: 16px;
  height: 56px;
  line-height: 56px;
  text-align: center;
  padding: 0 20px;
  position: relative;
  left: 0;
  top: 0;
}
.navi ul li a:focus {
  outline: none;
}
.navi ul li:first-child a {
  color: white;
}
.navi .nav_bg {
  height: 56px;
  width: 72px;
  background-color: #1dd388;
  border-radius: 10px;
  position: absolute;
  left: 0;
  top: 0;
  z-index: -1;
}
